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-如按可靠性分有：普通的，冗余的及安全型PLC（rdPLC）。
随着这些新产品的出现，还可对PLC作不同的的分类。显然，对PLC作以类分析，目的是使读者对PLC有一个大致的、而又是比较全面的了解。
我国有不少的厂家研制和生产过PLC，但是还没有出现有影响力和较大市场占有率的
产品，目前我国使用的PLC几乎都是国外品牌的产品。
在全世界上百个PLC制造厂中，有几家举足轻重的公司。它们是美国Rockwell自动化
公司所属的A．B(Allen＆Bradly)公司、GE-Fanuc公司，德国的西门子(Siemens)公司和法国的施耐德(Schneider)自动化公司，这几家公司控制着全世界80%以上的PLC市场，它们的系列产品有其技术广度和深度，从微型PLC到有上万个I／O(输入，输出)点的大型PLC应有尽有。
Aladdin Temp-Rite Food Heat Activator Induction Warmer
Keithley 7152 4x5 Low Current Matrix Card for 7001 7002
Alcon Legacy 20000 Phaco Emulsifier Surgical Eye Sys.
Welbilt ICE-O-Matic EF450 SelfContained Flake Ice Maker
Applied Biosystems Tropix TR717 Microplate Luminometer
AMAT Nor-Cal Intellisys Vacuum Control w/4" Gate Valve
AMAT Ebara ET-150 ET150 Turbo Molecular Pump Controller
AE Advanced Energy PDX 900-2V RF Generator 3156024-032A
Xycom 9460 10" Flat Panel LCD Operator PC Interface
TrippLite SU6K Unison Smart Online UPS Sys 6KVA 4200W
Varian SD-1400 Rotary Vane Mechanical Vacuum Pump 43CFM
Air Rover XL24 Portable Air Conditioner 27,400 BTU
Air Rover Portable Air Conditioner 27,400 BTU XL24
IBM 2105/F20 Enterprise DDM Storage Server w/Enclosure
PSB SYNCHRONY-TWO 300W Floor Tower Loudspeaker Speaker
HP Agilent OMNIBER 718 37718C Communications Analyzer
Pacific ScrubMaster 20B Walk-Behind Floor Scrubber
Fulcrum 224 24-Port 10-Gigabit CX4 Ethernet Switch
BAKER STERILGARD SG-400 4’ Bio Safety Cabinet Fume Hood
Sony HDM-14E5U 14" Color Video Monitor Evaluation Grade
Hanson Media-Mate Plus Lab Prep Dissolution System
GBC CombBind C800Pro Electric Punching Binding Machine
Kaeser AB550/AB-550 4HP AirBox Center Compressor FCS-35
Malcom PC-1TL Tabletop Digital Spiral Viscometer w/VS-3
DI NanoScope III Scanning Probe Microscope Controller
NuAire NU-425-400 II/A/B3 Lab Safety Cabinet Fume Hood
Unimet Unitron 8639 Inverted Metalograph Microscope
NEO Assist Vision AV-100 Color CCTV 20" Video Magnifier
Qualitau MIRA TDDB Volt Integrity Stress Test Chamber
G5 Vibramatic Professional Therapy Massage System
Rockwell Goko Seiki 3R Hardness Tester Scale/Kg Weight
Precision Scientific DD-300 Rotary Vane Vacuum Pump
HP 9000 RP3410 A7136A 2U Server PA8800 800MHz/4GB/146GB
Abatement PAS-1200 HEPA-AIRE Portable Air Scrubber Unit
Wyko PX2.5 Interference Microscope Objective Lens P 2.5
OptiVu HDVD 201 Surgical Videoscopy Base Station Sys
Windsor Saber Walk Behind 20" Automatic Floor Scrubber
Thyssenkrupp SL47 Citia Stairway Lift- Chair+Controller
3x Brocade FC4 32Port 4GB Fiber Channel Blade SAN Parts
Hi-T Drive Motorized Precision Linear Stage Slide Assy
AMAT Ebara PWM-12m Turbopump Turbo Molecular Pump Cable
Steris 99A2 System 1 Processor Endoscope Sterilizer
Beckman BIOMEK Stacker Carousel +MS-710 Scanner/Printer
Coherent Innova I-100 Argon Ion Laser w/Power Supply
Panasonic AJ-LT85 DVCPRO Digital Video Editor Laptop
Philips DCR-75 DVCPRO Digital Video Editor Laptop DVC
Ingersoll-Rand 2545/2545E10 Air Compressor Motor/Pump